Reinsurance Reinsurance (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Reinsurance [Abstract]
Gross Fee Income Earned Premium and Other Life	$ 804	$ 995
Assumed Premiums Earned, Life	3	1
Ceded Premiums Earned, Life	(409)	(174)
Net Fee Income Earned Premium and Other Life	$ 398	$ 822